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当海区有流无风时,输入对地速度,真运动显示方式荧光屏上,小岛回波的移动轨迹是:()
A . A、固定不动
B . B、按流向、流速移动
C . C、按与流相反方向、相同速度移动
D . D、以上均有可能
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